Quenched and tempered high-strength alloy steel 06ni9dr steel plate for ultra-low temperature pressure vessel and preparation method thereof

A pressure vessel and ultra-low temperature technology, which is applied in the field of steel plates for pressure vessels and its preparation, can solve the problems of dependence on imports and the difficulty of producing 06Ni9DR steel plates, and achieve the effects of avoiding welding magnetic deflection, good low-temperature performance, and good post-weld performance

CN106011627BActive Publication Date: 2017-09-19NANYANG HANYE SPECIAL STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-09-19

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Abstract

The invention provides a quenched and tempered high-strength alloy steel 06Ni9DR steel plate used for an ultralow-temperature pressure container and a preparation method of the quenched and tempered high-strength alloy steel 06Ni9DR steel plate. The steel plate comprises, by mass percent, 0.01 wt%-0.06 wt% of C, 0.10 wt%-0.20 wt% of Si, 0.50 wt%-0.80 wt% of Mn, smaller than or equal to 0.008 wt% of P, smaller than or equal to 0.002 wt% of S, 8.5 wt%-9.5 wt% of Ni, smaller than or equal to 0.10 wt% of Cu, smaller than or equal to 0.10 wt% of Mo, smaller than or equal to 0.005 wt% of V, smaller than or equal to 0.25 wt% of Cr and the balance Fe and inevitable impurities. According to the quenched and tempered high-strength alloy steel 06Ni9DR steel plate used for the ultralow-temperature pressure container, by means of the reasonable chemical component design, the cleanliness synergistic and effective process of steel is effectively implemented through the RH+LF+RH process, and the prepared steel plate has the beneficial effects of being high in strength, excellent in low-temperature tenacity, good in post-welding performance, and the like.
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Description

technical field

[0001] The invention relates to a steel plate for pressure vessels and a preparation method thereof, in particular to a quenched and tempered high-strength alloy steel 06Ni9DR steel plate for ultra-low temperature pressure vessels and a preparation method thereof. Background technique

[0002] 06Ni9DR steel is commonly known as 9% Ni steel, Ni9 steel, 9Ni steel, etc. It is a quenched and tempered high-strength alloy steel for ultra-low temperature storage tanks and pressure vessels containing 8.5-9.5% Ni. It is an important structural material for ultra-low temperature equipment and containers. Used to manufacture or construct liquid nitrogen and natural gas (Liquefied Natural Gas: LNG for short) storage tanks. For example, LNG ships for liquefied natural gas and storage tanks for storing liquefied natural gas will use a large amount of low-temperature steel 06Ni9DR. It has the characteristics of high yield strength and tensile strength, good low-temperature...

Examples

Embodiment 1

[0031]A quenched and tempered high-strength alloy steel 06Ni9DR steel plate for ultra-low temperature pressure vessels, including the following chemical components in mass percentages (unit, wt%): C: 0.01, Si: 0.20, Mn: 0.50, P: 0.006, S: 0.002, Ni : 8.5, Cu: 0.10, Mo: 0.01, V: 0.005, Cr: 0.10, Als: 0.015, N: 0.012, and the balance is Fe and unavoidable impurities.

[0032] Wherein, the carbon equivalent of the alloy steel plate [Ceq=C+Mn / 6+(Cr+V+Mo) / 5+(Cu+Ni) / 15]=0.10%, and the thickness of the steel plate is 12mm.

[0033] Its preparation method comprises the following steps:

[0034] (1) KR hot metal pretreatment: use the ladle to carry the hot metal, remove the former slag from the hot metal at the station, control the content of P and S in the hot metal, after the hot metal is stirred and desulfurized by KR, the hot metal P≤0.1%, S≤0.004%, and the desulfurization cycle≤25min , desulfurization temperature drop ≤ 20 ℃; after desulfurization is completed, the slag layer is ...

Embodiment 2

[0047] A quenched and tempered high-strength alloy steel 06Ni9DR steel plate for ultra-low temperature pressure vessels, including the following chemical components in mass percentages (unit, wt%): C: 0.03, Si: 0.14, Mn: 0.69, P: 0.005, S: 0.001, Ni : 9.4, Cu: 0.01, Mo: 0.01, V: 0.003, Cr: 0.25, Als: 0.020, N: 0.00189, and the balance is Fe and unavoidable impurities.

[0048] Wherein, the carbon equivalent of the alloy steel plate [Ceq=C+Mn / 6+(Cr+V+Mo) / 5+(Cu+Ni) / 15]=0.50%, and the thickness of the steel plate is 40mm.

[0049] Its preparation method comprises the following steps:

[0050] (1) KR hot metal pretreatment: use the ladle to carry the hot metal, remove the former slag from the hot metal at the station, control the content of P and S in the hot metal, after the hot metal is stirred and desulfurized by KR, the hot metal P≤0.1%, S≤0.004%, and the desulfurization cycle≤25min , desulfurization temperature drop ≤ 20 ℃; after desulfurization is completed, the slag layer ...

Embodiment 3

[0063] A quenched and tempered high-strength alloy steel 06Ni9DR steel plate for ultra-low temperature pressure vessels, including the following chemical components in mass percent (unit, wt%): C: 0.03, Si: 0.14, Mn: 0.68, P: 0.005, S: 0.001, Ni : 9.4, Cu: 0.09, Mo: 0.01, V: 0.003, Cr: 0.20, Als: 0.020, N: 0.00195, and the balance is Fe and unavoidable impurities.

[0064] Wherein, the carbon equivalent of the alloy steel plate [Ceq=C+Mn / 6+(Cr+V+Mo) / 5+(Cu+Ni) / 15]=0.15%, and the thickness of the steel plate is 50mm.

[0065] Its preparation method comprises the following steps:

[0066] (1) KR hot metal pretreatment: use the ladle to carry the hot metal, remove the former slag from the hot metal at the station, control the content of P and S in the hot metal, after the hot metal is stirred and desulfurized by KR, the hot metal P≤0.1%, S≤0.004%, and the desulfurization cycle≤25min , desulfurization temperature drop ≤ 20 ℃; after desulfurization is completed, the slag layer is s...